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<!DOCTYPE html>
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SpuerCheng | Blog
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<div class="post-preview">
<a href="/article/hadoop1/">
<h2 class="post-title">
Hadoop单节点安装及常见问题
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
Hadoop官网地址：http://hadoop.apache.org/
hadoop官网十分详细的介绍了hadoop的主要功能，有一定英语阅读习惯的小伙伴，可以通过官网学习。hadoop虽然在linux和window系统上都能安装，但是我们一般还是选择在linux系统上运行hadoop。
hadoop2.6版本安装步骤
1、安装hadoop之前，一些基础软件必须安装，安装与hadoop版本......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2019-11-29
</p>
<div class="tags">
<a href="/tags/#Hadoop Ssh" title="Hadoop Ssh">Hadoop Ssh</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/文件存储格式/">
<h2 class="post-title">
大数据文件存储格式对比
</h2>
<h3 class="post-subtitle">
SequenceFile Avro parquet Orc的对比
</h3>
<div class="post-content-preview">
SequenceFile
1、相比于text格式的文件，SequenceFile可以存储key-value格式的消息，方便mapreduce引擎处理数据。
2、支持record级别的压缩和block级别的压缩
3、文件是分块的，因此是可分割的。支持mapreduce的split输入
4、使用sequencefile还可以将多个小文件合并到一个大文件中，通过key-value的形式组织起来，此......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-05-11
</p>
<div class="tags">
<a href="/tags/#SequenceFile Avro parquet Orc" title="SequenceFile Avro parquet Orc">SequenceFile Avro parquet Orc</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hive1/">
<h2 class="post-title">
hive解决中文乱码
</h2>
<h3 class="post-subtitle">
SequenceFile Avro parquet Orc的对比
</h3>
<div class="post-content-preview">
创建表的时候，commnet说明字段包含中文，表创建成功之后，中文显示乱码。
1234567891011121314create external table movie(userID int comment '用户ID',movieID int comment '电影ID',rating int comment '电影评分',timestamped bigint comment '评分时间......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-03-15
</p>
<div class="tags">
<a href="/tags/#hive utf8" title="hive utf8">hive utf8</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hivesql/">
<h2 class="post-title">
hive常见
</h2>
<h3 class="post-subtitle">
SequenceFile Avro parquet Orc的对比
</h3>
<div class="post-content-preview">
1、Hive SQL问题
下面有这样一张用户登录情况表格，需要求出用户连续登录的天数：
第一列是登录时间，第二列是用户ID.
dt
userid
2017-12-12
abc
2017-12-13
abc
2017-12-15
abc
2017-12-14
def
2017-12-15
def
2017-12-17
def
2017-12-18
def......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-03-14
</p>
<div class="tags">
<a href="/tags/#hive" title="hive">hive</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/mysql1/">
<h2 class="post-title">
mysql常见
</h2>
<h3 class="post-subtitle">
SequenceFile Avro parquet Orc的对比
</h3>
<div class="post-content-preview">
mysql行转列
有如下的表格 t
year
month
amount
1991
1
1.1
1991
2
1.2
1991
3
1.3
1991
4
1.4
1992
1
2.1
1992
2
2.2
1992
3
2.3
1992
4
2.4
转换成
year
m1
m2
m3
m4
1991
1.1
1.2
1.3
1.4
......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-03-11
</p>
<div class="tags">
<a href="/tags/#mysql 行转列 列转行 substring_index" title="mysql 行转列 列转行 substring_index">mysql 行转列 列转行 substring_index</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hadoop7/">
<h2 class="post-title">
Hdfs上恢复删除文件的方法
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
背景： 每天操作Hdfs难免会误删除文件，下面介绍几种恢复删除文件的方法
通过垃圾箱恢复
HDFS 为我们提供了垃圾箱机制，当我们执行hadoop fs -rmr xxx命令之后，文件并不会马上删除，而会被移动到执行这个操作用户的 .Trash 目录下。等待一段时间后才执行真正的删除操作。这个时间可以通过在core-default.xml配置文件里添加fs.trash.interval参数设......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-01-15
</p>
<div class="tags">
<a href="/tags/#hdfs Trash SnapShot fsimage edits" title="hdfs Trash SnapShot fsimage edits">hdfs Trash SnapShot fsimage edits</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hadoop5/">
<h2 class="post-title">
副本放置、读写流程、PID文件、磁盘均衡、安全模式
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
hdfs副本放置策略
第一个副本放置在上传文件的DataNode服务器节点上，如果是在集群外提交，则随机放置在一个DataNode服务器节点上。
第二个副本放置在与第一个DataNode不同的机架的一个节点上。
第三个副本放置在与第二个DataNode相同的机架的不同节点上。
更多副本：随机节点放置。
为了最小化全局带宽消耗和读取延迟，HDFS尝试满足来自离读取器最近的副本的读取请求。如果......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-01-15
</p>
<div class="tags">
<a href="/tags/#hdfs hadoop pid safemode balancer" title="hdfs hadoop pid safemode balancer">hdfs hadoop pid safemode balancer</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/mysqltopn/">
<h2 class="post-title">
Mysql TOP函数实现
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
前言： 工作中常常会遇见，查询分组后的最大值、最小值所在整行的记录或者分组后的topn行记录，但是mysql只支持聚合函数，而不支持分函数。
准备了一份数据test1
Top1实现
使用自连接推荐
1234567891011121314151617181920212223242526272829303132333435363738SELECT a. NAME, a.course, a.sc......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2018-01-10
</p>
<div class="tags">
<a href="/tags/#mysql top" title="mysql top">mysql top</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hadoop3/">
<h2 class="post-title">
HDFS常用命令总结
</h2>
<h3 class="post-subtitle">
</h3>
<div class="post-content-preview">
1、Hadoop安装好之后，配置hadoop安装目录的 bin、sbin文件到我们的个人环境变量 .bashrc下，hdfs命令存储在这两个文件夹下面。
2、==-help：显示帮助信息==
1hadoop fs -help rm
3、==-ls:显示目录信息==
1hadoop fs -ls /
4、==-mkdir:在hdfs上创建目录==
1hadoop fs -mkdir /user......
</div>
</a>
<p class="post-meta" style="margin: 10px 0;">
Posted by SpuerCheng on
2017-12-02
</p>
<div class="tags">
<a href="/tags/#hdfs hadoop" title="hdfs hadoop">hdfs hadoop</a>
</div>
</div>
<hr>
<div class="post-preview">
<a href="/article/hadoop4/">
<h2 class="post-title">
Block、小文件、HDFS架构、SNN流程
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Block的理解
*物理角度的块概念：
扇区是磁盘最小的物理存储单元，一般而言是每个扇区512B大小，但是操作通常不直接管理每一个扇区，而是通过将若干个扇区组成的一个更大的集合来去进行操作管理。 这个比扇区更大的集合，在Windows下叫做簇；在Linux下叫做块（block）。
建立在该磁盘之上的文件系统也有‘block’的概念，一般为磁盘‘block’大小的整数倍。对于用户来说，这些读写......
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Posted by SpuerCheng on
2017-12-02
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